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Echocardiograms During Six Hours of Bedrest at Head-Down and Head-Up Tilt and During Space FlightLathers, Claire M.; Riddle, Jeanne M.; Mulvagh, Sharon L.; Mukai, Chiaki; Diamandis, Peter H.; Dussack, Larry G.; Bungo, Michael W.; Charles, John B. · The Journal of Clinical Pharmacology · 1993